An East Waterford man was in serious condition this morning in York Hospital, where he was flown after a one-vehicle accident Tuesday evening in the 2200 block of Path Valley Road in Metal Township. Pennsylvania State Police said Richard Piper Jr., 43, lost control on a curve and his vehicle hit a tree at 8:20 p.m. Police, who believe he was thrown from the vehicle, said Piper suffered major injuries to his head, neck and arms, as well as possible internal injuries.